Fix that variable names with dots are interpreted as paths

[nilmerg]

fixes #757

[nilmerg]

Tested with: (plus some restrictions)

apply Service "with-domain-customvar-names" {
  import "generic-service"

  check_command = "random fortune"
  check_interval = 5m
  retry_interval = 1m

  vars = {
    is_dummy = true
    issue_no = 757
    "example.com" = "abc"
    "ex.ample.com" = "cba"
    "example.0.org" = "xyz"
    "example[1]" = "zyx"
    "real_list" = ["one", "two", "three"]
    "ob" = {
      "je" = {
        "ct" = "tcejbo"
      }
    }
    "ex" = {
      "ample.com" = {
        "bla" = "blub"
      }
    }
    vhosts = {"xxxxxxxxxxxxx.mgmt.xxxxxx.com"={http_port="443"},}
  }

  assign where host.name == "docker-master"
}

[yhabteab]

apply Service "Test" {
    import "generic-service"

    check_command = "random fortune"

    vars = {
      "yonas.de" = null
      "example[1]" = {}
      examples["Joooo"] = []
      examples["Joooo"][0] = []
    }

    assign where host.name == "docker-master"
}

Database:

SELECT * FROM customvar INNER JOIN service_customvar sc on customvar.id = sc.customvar_id INNER JOIN service s on s.id = sc.service_id WHERE s.name='Test'

[yhabteab]

Monitoring:

[nilmerg]

This is an issue with Icinga DB: Icinga/icingadb#597